I love the 5S form factor as well. I only updated from it earlier this year to get iOS 13 to use the COVID Alert app here in Canada (and my upgrade was buying a smashed-screen iPhone SE for next to nothing, of course, and swapping the old phone's screen onto it).
What's in your back pocket? Seriously, love my SE. I just got the battery replaced, $49 taken from a MacBook trade-in value, so basically free since I can't use that money any other way.